REPORT ON THE RADIOLARIA. 1211 



1. Clathrocanium squarrosum, Ehrenberg. 



Clathrocanium sqiMrromm, Ehrenberg, 1872, Abhandl. d. k. AkaJ. d. Wiss. Berlin, p. 287, 

 Taf. vii. fig. 5. 



Cephalis campanulate, with irregular roundish pores and a pyramidal horn of the same length, 

 bearing at the apex three short branches. Length of the two joints 2 : 3, breadth = 2:6. Thorax 

 with three simple, prismatic, thin ribs, which are twice as long as the cephalis, separated by large 

 triangular holes and connected only at the distal end by a small triangular ring of delicate lattice- 

 work. Peristome smooth, wide, as broad as the thorax. 



Dimensions. — Cephalis 0-04, long, 0'04 broad ; thorax 0-OG long, 012 broad. 



Habitat. — Western Tropical Pacific (Philippine Sea), depth 3300 fathoms. 



2. Clathrocanium sphceroceplialum, n. sp. (PL 64, fig. 1). 



Cephalis spherical, with regular circular pores and a prismatic horn of the same length, with 

 three serrated edges. Length of the two joints = 2:3, breadth 2 : 4. Thorax with three broad, 

 triangular, latticed, divergent ribs, which are separated by three large ovate holes (about as large as 

 the cephalis), and connected at the distal end by a broad fenestrated circular ring of regular 

 lattice-work (about six pores in its height). Peristome smooth, constricted, half as broad as 

 the thorax. 



Dimensions. — Cephalis 0-04 long, 0-04 broad ; thorax O'OG long, O'OS broad. 



Habitat. — Western Tropical Pacific, Station 225, depth 4475 fathoms. 



3. Clathrocanium coarctatum, Ehrenberg. 



Clathrocanium coarctatum, Ehrenberg, 1872, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 287, 



Taf. vii. fig. 6. 

 Lychnocanium fenesfratum, Ehrenberg, 1860, Monatsber. d. k. preuss. Akad. d. Wiss. Berlin, 



p. 767. 



Cephalis spherical, thorny, with regular circular pores and a simple pyramidal horn of the same 

 length. Length of the two joints = 2:3, breadth = 2:5. Thorax with three simple, prismatic, 

 little prominent ribs, which are separated by three large ovate holes (twice as long as the cephalis), 

 and connected below the prominent distal end by a narrow circular ring of delicate lattice-work. 

 Peristome smooth, wide, little narrower than the thorax. 



Dimensions. — Cephalis 0"03 long, 0-04 broad; thorax 0'06 long, 01 broad. 



Habitat. — Western Tropical Pacific (Philippine Sea), depth 3300 fathoms. 



4. Clathrocanium triomma, n. sp. (PL 64, fig. 3). 



Cephalis spherical, thorny, with regular circular pores, and a slender prismatic horn of twice the 

 length, bearing at its apex three short recurved branches. Length of the two joints = 2:4, breadth 

 = 2:5. Thorax with three broad prismatic, fenestrated ribs, which are separated by three large sub- 



